Recursos de colección

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Siewert, Matthias Benjamin
Soil organic carbon (SOC) stored in northern peatlands and permafrost-affected soils are key components in the global carbon cycle. This contribution provides maps of SOC in a sub-arctic mountainous peatland environment in the discontinuous permafrost zone for the Stordalen area in the Abisko region, northern Sweden. Four machine-learning techniques were evaluated for SOC quantification: multiple linear regression, artificial neural networks, support vector machine and random forest. The random forest model performed best and was used to predict SOC for several depth increments at a spatial resolution of 1 m (1 × 1 m). A high-resolution (1 m) land cover classification...

Witte, Hannelore; Boebel, Olaf
This data set was collected during the R. V. Polarstern cruise PS103. Outside territorial waters, current velocities were measured nearly continuously along the ship's track with a vessel-mounted TRD Instruments 153.6-kHz Ocean Surveyor ADCP. The transducers were located 11 meters below the water line and were protected against ice floes by an acoustically transparent plastic window. The current measurements used a pulse of 2 seconds and vertical bin length of 4 meters. The ship's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). Heading, roll and pitch data from the ship's gyro platforms and the navigation...